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Principles of Geotechnical Enginee...

9th Edition
Braja M. Das + 1 other
ISBN: 9781305970939

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BuyFindarrow_forward

Principles of Geotechnical Enginee...

9th Edition
Braja M. Das + 1 other
ISBN: 9781305970939
Textbook Problem

Refer to Figure 7.24. The following data were collected during the field permeability measurement of a confined aquifer using a pumping test. Determine the hydraulic conductivity of the permeable layer. Use Eq. (7.49).

Thickness of the aquifer, H = 4.5 m

Piezometric level and radial distance of the first observation well:

h1 = 2.9 m; r1 = 17.8 m

Piezometric level and radial distance of the second observation well:

h2 = 1.8 m; r2 = 8.1 m

Rate of discharge from pumping, q = 0.5 m3/min

To determine

Find the hydraulic conductivity of the permeable layer.

Explanation

Given information:

The thickness of the aquifer H is 4.5 m.

The Piezometric level of the first observation well (h1) is 2.9 m.

The radial distance of the first observation well (r1) is 17.8 m.

The Piezometric level of the second observation well (h2) is 1.8 m.

The radial distance of the second observation well (r2) is 8.1 m.

The rate of discharge from pumping (q) is 0.5m3/min.

Calculation:

Determine the hydraulic conductivity of the permeable layer using the relation.

k=qlog10(r1r2)2.727H(h1h2)

Substitute 0.5m3/min for q, 17

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